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Submission #871935

# Submission time Handle Problem Language Result Execution time Memory
871935 2023-11-12T00:11:44 Z 12345678 Railway (BOI17_railway) C++17
100 / 100
 122 ms 38468 KB 
#include <bits/stdc++.h>

using namespace std;

const int nx=1e5+5, kx=17;
int n, m, k, pa[nx][kx], lvl[nx], ed[nx], hv[nx], in[nx], out[nx], rv[nx], t, u, v, x, lc, sz[nx], cnt;
bool dp[nx];
vector<pair<int, int>> d[nx];
vector<int> add[nx], erase[nx];
queue<int> q;
set<int> ans;

void dfs(int u, int p)
{
    lvl[u]=lvl[p]+1;
    pa[u][0]=p;
    in[u]=++t;
    rv[t]=u;
    for (int i=1; i<kx; i++) pa[u][i]=pa[pa[u][i-1]][i-1];
    for (auto [v, id]:d[u]) 
    {
        if (v==p) continue;
        ed[v]=id; dfs(v, u); sz[u]+=sz[v];
        if (sz[v]>sz[hv[u]]) hv[u]=v;
    }
    sz[u]++;
    out[u]=t;
}

int lca(int u, int v)
{
    if (lvl[u]>lvl[v]) swap(u, v);
    for (int i=kx-1; i>=0; i--) if (lvl[pa[v][i]]>=lvl[u]) v=pa[v][i];
    if (u==v) return u;
    for (int i=kx-1; i>=0; i--) if (pa[u][i]!=pa[v][i]) u=pa[u][i], v=pa[v][i];
    return pa[u][0];
}

void insert(int u)
{
    for (auto tmp:add[u]) if (!dp[tmp]) dp[tmp]=1, cnt++;
}

void remove(int u)
{
    for (auto tmp:erase[u]) if (dp[tmp]) dp[tmp]=0, cnt--;
}

void dfs2(int u, int p, bool del)
{
    for (auto [v, id]:d[u]) if (v!=p&&v!=hv[u]) dfs2(v, u, 1);
    if (hv[u]) dfs2(hv[u], u, 0);
    for (auto [v, id]:d[u]) if (v!=p&&v!=hv[u]) for (int i=in[v]; i<=out[v]; i++) insert(rv[i]);
    for (auto [v, id]:d[u]) if (v!=p&&v!=hv[u]) for (int i=in[v]; i<=out[v]; i++) remove(rv[i]);
    insert(u);
    remove(u);
    if (u!=1&&cnt>=k) ans.insert(ed[u]);
    if (del)
    {
        cnt=0;
        for (int i=in[u]; i<=out[u]; i++) for (auto tmp:add[rv[i]]) dp[tmp]=0;
    }
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>m>>k;
    for (int i=1; i<n; i++) cin>>u>>v, d[u].push_back({v, i}), d[v].push_back({u, i});
    dfs(1, 1);
    for (int i=1; i<=m; i++)
    {
        cin>>x>>u;
        lc=u;
        add[u].push_back(i);
        for (int j=0; j<x-1; j++) cin>>u, lc=lca(lc, u), add[u].push_back(i);
        erase[lc].push_back(i);
    }
    for (int i=1; i<=n; i++) sz[i]=add[i].size()+erase[i].size();
    dfs2(1, 1, 0);
    cout<<ans.size()<<'\n';
    for (auto tmp:ans) cout<<tmp<<' ';
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8792 KB Output is correct
2 Correct 6 ms 11864 KB Output is correct
3 Correct 6 ms 11924 KB Output is correct
4 Correct 2 ms 8796 KB Output is correct
5 Correct 2 ms 8796 KB Output is correct
6 Correct 6 ms 12636 KB Output is correct
7 Correct 6 ms 12132 KB Output is correct
8 Correct 5 ms 12124 KB Output is correct
9 Correct 6 ms 11864 KB Output is correct
10 Correct 2 ms 8792 KB Output is correct
11 Correct 2 ms 8796 KB Output is correct
12 Correct 2 ms 8796 KB Output is correct
13 Correct 2 ms 8796 KB Output is correct
14 Correct 2 ms 8796 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8792 KB Output is correct
2 Correct 6 ms 11864 KB Output is correct
3 Correct 6 ms 11924 KB Output is correct
4 Correct 2 ms 8796 KB Output is correct
5 Correct 2 ms 8796 KB Output is correct
6 Correct 6 ms 12636 KB Output is correct
7 Correct 6 ms 12132 KB Output is correct
8 Correct 5 ms 12124 KB Output is correct
9 Correct 6 ms 11864 KB Output is correct
10 Correct 2 ms 8792 KB Output is correct
11 Correct 2 ms 8796 KB Output is correct
12 Correct 2 ms 8796 KB Output is correct
13 Correct 2 ms 8796 KB Output is correct
14 Correct 2 ms 8796 KB Output is correct
15 Correct 20 ms 12888 KB Output is correct
16 Correct 23 ms 13148 KB Output is correct
17 Correct 21 ms 13148 KB Output is correct
18 Correct 8 ms 12748 KB Output is correct
19 Correct 6 ms 12096 KB Output is correct
20 Correct 30 ms 13484 KB Output is correct
21 Correct 24 ms 13148 KB Output is correct
22 Correct 2 ms 8796 KB Output is correct
23 Correct 6 ms 11972 KB Output is correct
24 Correct 6 ms 11868 KB Output is correct
25 Correct 2 ms 8796 KB Output is correct
26 Correct 2 ms 8816 KB Output is correct
27 Correct 6 ms 12632 KB Output is correct
28 Correct 6 ms 12124 KB Output is correct
29 Correct 5 ms 11868 KB Output is correct
30 Correct 5 ms 11868 KB Output is correct
31 Correct 2 ms 8796 KB Output is correct
32 Correct 2 ms 8792 KB Output is correct
33 Correct 2 ms 8844 KB Output is correct
34 Correct 2 ms 8792 KB Output is correct
35 Correct 2 ms 8796 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 101 ms 38460 KB Output is correct
2 Correct 2 ms 8844 KB Output is correct
3 Correct 115 ms 36696 KB Output is correct
4 Correct 78 ms 34384 KB Output is correct
5 Correct 110 ms 37780 KB Output is correct
6 Correct 93 ms 38232 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 66 ms 27892 KB Output is correct
2 Correct 57 ms 23656 KB Output is correct
3 Correct 66 ms 23128 KB Output is correct
4 Correct 82 ms 23536 KB Output is correct
5 Correct 92 ms 23200 KB Output is correct
6 Correct 57 ms 28364 KB Output is correct
7 Correct 57 ms 28224 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 66 ms 27892 KB Output is correct
2 Correct 57 ms 23656 KB Output is correct
3 Correct 66 ms 23128 KB Output is correct
4 Correct 82 ms 23536 KB Output is correct
5 Correct 92 ms 23200 KB Output is correct
6 Correct 57 ms 28364 KB Output is correct
7 Correct 57 ms 28224 KB Output is correct
8 Correct 69 ms 29416 KB Output is correct
9 Correct 69 ms 29268 KB Output is correct
10 Correct 90 ms 38108 KB Output is correct
11 Correct 92 ms 37716 KB Output is correct
12 Correct 77 ms 23828 KB Output is correct
13 Correct 64 ms 23760 KB Output is correct
14 Correct 84 ms 22868 KB Output is correct
15 Correct 64 ms 23124 KB Output is correct
16 Correct 79 ms 23228 KB Output is correct
17 Correct 84 ms 23248 KB Output is correct
18 Correct 80 ms 23388 KB Output is correct
19 Correct 59 ms 23632 KB Output is correct
20 Correct 74 ms 29268 KB Output is correct
21 Correct 81 ms 29780 KB Output is correct
22 Correct 72 ms 29524 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8792 KB Output is correct
2 Correct 6 ms 11864 KB Output is correct
3 Correct 6 ms 11924 KB Output is correct
4 Correct 2 ms 8796 KB Output is correct
5 Correct 2 ms 8796 KB Output is correct
6 Correct 6 ms 12636 KB Output is correct
7 Correct 6 ms 12132 KB Output is correct
8 Correct 5 ms 12124 KB Output is correct
9 Correct 6 ms 11864 KB Output is correct
10 Correct 2 ms 8792 KB Output is correct
11 Correct 2 ms 8796 KB Output is correct
12 Correct 2 ms 8796 KB Output is correct
13 Correct 2 ms 8796 KB Output is correct
14 Correct 2 ms 8796 KB Output is correct
15 Correct 20 ms 12888 KB Output is correct
16 Correct 23 ms 13148 KB Output is correct
17 Correct 21 ms 13148 KB Output is correct
18 Correct 8 ms 12748 KB Output is correct
19 Correct 6 ms 12096 KB Output is correct
20 Correct 30 ms 13484 KB Output is correct
21 Correct 24 ms 13148 KB Output is correct
22 Correct 2 ms 8796 KB Output is correct
23 Correct 6 ms 11972 KB Output is correct
24 Correct 6 ms 11868 KB Output is correct
25 Correct 2 ms 8796 KB Output is correct
26 Correct 2 ms 8816 KB Output is correct
27 Correct 6 ms 12632 KB Output is correct
28 Correct 6 ms 12124 KB Output is correct
29 Correct 5 ms 11868 KB Output is correct
30 Correct 5 ms 11868 KB Output is correct
31 Correct 2 ms 8796 KB Output is correct
32 Correct 2 ms 8792 KB Output is correct
33 Correct 2 ms 8844 KB Output is correct
34 Correct 2 ms 8792 KB Output is correct
35 Correct 2 ms 8796 KB Output is correct
36 Correct 101 ms 38460 KB Output is correct
37 Correct 2 ms 8844 KB Output is correct
38 Correct 115 ms 36696 KB Output is correct
39 Correct 78 ms 34384 KB Output is correct
40 Correct 110 ms 37780 KB Output is correct
41 Correct 93 ms 38232 KB Output is correct
42 Correct 66 ms 27892 KB Output is correct
43 Correct 57 ms 23656 KB Output is correct
44 Correct 66 ms 23128 KB Output is correct
45 Correct 82 ms 23536 KB Output is correct
46 Correct 92 ms 23200 KB Output is correct
47 Correct 57 ms 28364 KB Output is correct
48 Correct 57 ms 28224 KB Output is correct
49 Correct 69 ms 29416 KB Output is correct
50 Correct 69 ms 29268 KB Output is correct
51 Correct 90 ms 38108 KB Output is correct
52 Correct 92 ms 37716 KB Output is correct
53 Correct 77 ms 23828 KB Output is correct
54 Correct 64 ms 23760 KB Output is correct
55 Correct 84 ms 22868 KB Output is correct
56 Correct 64 ms 23124 KB Output is correct
57 Correct 79 ms 23228 KB Output is correct
58 Correct 84 ms 23248 KB Output is correct
59 Correct 80 ms 23388 KB Output is correct
60 Correct 59 ms 23632 KB Output is correct
61 Correct 74 ms 29268 KB Output is correct
62 Correct 81 ms 29780 KB Output is correct
63 Correct 72 ms 29524 KB Output is correct
64 Correct 74 ms 29556 KB Output is correct
65 Correct 89 ms 24748 KB Output is correct
66 Correct 77 ms 24436 KB Output is correct
67 Correct 79 ms 23892 KB Output is correct
68 Correct 94 ms 23200 KB Output is correct
69 Correct 49 ms 23124 KB Output is correct
70 Correct 122 ms 31300 KB Output is correct
71 Correct 64 ms 28716 KB Output is correct
72 Correct 2 ms 8796 KB Output is correct
73 Correct 6 ms 11868 KB Output is correct
74 Correct 6 ms 11872 KB Output is correct
75 Correct 2 ms 8844 KB Output is correct
76 Correct 2 ms 8796 KB Output is correct
77 Correct 7 ms 12636 KB Output is correct
78 Correct 6 ms 12124 KB Output is correct
79 Correct 5 ms 11868 KB Output is correct
80 Correct 5 ms 12048 KB Output is correct
81 Correct 2 ms 9048 KB Output is correct
82 Correct 2 ms 8796 KB Output is correct
83 Correct 2 ms 8796 KB Output is correct
84 Correct 2 ms 8620 KB Output is correct
85 Correct 2 ms 8796 KB Output is correct
86 Correct 19 ms 12972 KB Output is correct
87 Correct 27 ms 13140 KB Output is correct
88 Correct 22 ms 13268 KB Output is correct
89 Correct 6 ms 12636 KB Output is correct
90 Correct 6 ms 12124 KB Output is correct
91 Correct 22 ms 13404 KB Output is correct
92 Correct 22 ms 13140 KB Output is correct
93 Correct 2 ms 8796 KB Output is correct
94 Correct 94 ms 38468 KB Output is correct
95 Correct 90 ms 36620 KB Output is correct
96 Correct 81 ms 34388 KB Output is correct
97 Correct 89 ms 37588 KB Output is correct
98 Correct 92 ms 38228 KB Output is correct
99 Correct 101 ms 23384 KB Output is correct
100 Correct 61 ms 23124 KB Output is correct
101 Correct 66 ms 23204 KB Output is correct
102 Correct 60 ms 23720 KB Output is correct
103 Correct 55 ms 28244 KB Output is correct
104 Correct 70 ms 29476 KB Output is correct
105 Correct 56 ms 27988 KB Output is correct
106 Correct 72 ms 29816 KB Output is correct
107 Correct 65 ms 29004 KB Output is correct
108 Correct 112 ms 38136 KB Output is correct
109 Correct 90 ms 37868 KB Output is correct
110 Correct 56 ms 23636 KB Output is correct
111 Correct 54 ms 23876 KB Output is correct
112 Correct 75 ms 22868 KB Output is correct
113 Correct 66 ms 23124 KB Output is correct